New Document
This document describes the password recovery procedure for
the
following Cisco products:
Cisco 827
Cisco 1003
Cisco 1004
Cisco 1005
Cisco 1400
Cisco 1600
Cisco 1700
Cisco 2600
Cisco 3600
Cisco 4500
Cisco 4700
Cisco AS5x00
Cisco 6x00
Cisco 7000 (RSP7000)
Cisco 7100
Cisco 7200
Cisco 7500
Cisco uBR7200
Cisco 12000
Cisco LS1010
Catalyst 2948G-L3
Catalyst 4840G
Catalyst 4908G-L3
Catalyst 5500 (RSM)
Catalyst 8510-CSR
Catalyst 8510-MSR
Catalyst 8540-CSR
Catalyst 8540-MSR
Cisco MC3810
Cisco NI-2
Cisco VG200 Analog Gateway
Route Processor Module
Step-by-Step Procedure
Attach a terminal or PC with terminal emulation to the
console port
of the router. Use the following terminal settings:
9600 baud rate
No parity
8 data bits
1 stop bit
No flow control
The required console cable specifications are described in
the Cabling Guide for RJ-45 Console and AUX Ports (Cisco's 1000
series,
2500 series, and AS5100).
Type show version and record the setting of the
configuration
register. Click here to see output of a show version
command.
The configuration register setting is usually 0x2102 or
0x102.
Using the power switch, turn off the router and then turn
it on.
Important: To simulate step 3 on a Cisco 6400, pull out
then replace
the Node Route Processor (NRP) or Node Switch Processor
(NSP) card.
Important: To simulate step 3 on a Cisco 6x00 using NI-2,
pull out
then replace the NI-2 card.
Press Break on the terminal keyboard within 60 seconds of
the powerup
to put the router into ROMMON.
If the break sequence doesn't work, see Possible Key
Combinations for
Break Sequence During Password Recovery for other key
combinations.
Type confreg 0x2142 at the rommon 1> prompt to boot from
Flash
without loading the configuration.
Type reset at the rommon 2> prompt.
The router reboots but ignores its saved configuration.
Type no after each setup question or press Ctrl-C to skip
the initial
setup procedure.
Type enable at the Router> prompt.
You'll be in enable mode and see the Router# prompt.
Important: Type config mem or copy start running to copy
the
nonvolatile RAM (NVRAM) into memory. Do not type config
term.
Type wr term or show running.
The show running and wr term commands show the
configuration of the
router. In this configuration you see under all the
interfaces the
shutdown command, which means all interfaces are currently
shutdown.
Also, you can see the passwords either in encrypted or
unencrypted
format.
Type config term and make the changes.
The prompt is now hostname(config)#.
Type enable secret .
Issue the no shutdown command on every interface that is
used. If you
issue a show ip interface brief command, every interface
that you
want to use should be "up up".
Type config-register 0x2102, or the value you recorded in
step 2.
Press Ctrl-z to leave the configuration mode.
The prompt is now hostname#.
Type write mem or copy running startup to commit the
changes.
Example of Password Recovery on a Cisco 2600
The following example shows password recovery on a Cisco
2600.
--------------------------------------------------------------------
Router>en
Password:
Password:
Password:
% Bad secrets
Router>sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T,
RELEASE
SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:21 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE
(fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash:c2600-is-mz.120-7.T"
cisco 2611 (MPC860) processor (revision 0x202) with
26624K/6144K
bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
--More-- 8192K bytes of processor board System flash
partition 1
(Read/Write)
8192K bytes of processor board System flash partition 2
(Read/Write)
Configuration register is 0x2102
Router>
!--- The router was just powercycled and during bootup a
!--- break sequence was sent to the router.
!
*** System received an abort due to Break Key ***
signal= 0x3, code= 0x500, context= 0x813ac158
PC = 0x802d0b60, Vector = 0x500, SP = 0x80006030
rommon 1 > confreg 0x2142
You must reset or power cycle for new config to take effect
rommon 2 > reset
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 32768 Kbytes of main memory
program load complete, entry point: 0x80008000, size:
0x6fdb4c
Self decompressing the image :
###############################
############################################################
##
############################################################
##
############################################################
##
############################### [OK]
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T,
RELEASE
SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:21 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
cisco 2611 (MPC860) processor (revision 0x202) with
26624K/6144K
bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash partition 1
(Read/Write)
8192K bytes of processor board System flash partition 2
(Read/Write)
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog?
[yes/no]: n
Press RETURN to get started!
00:00:19: %LINK-3-UPDOWN: Interface BRI0/0, changed state
to up
00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/0, changed
state to up
00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/1, changed
state to up
00:00:19: %LINK-3-UPDOWN: Interface Serial0/0, changed
state to down
00:00:19: %LINK-3-UPDOWN: Interface Serial0/1, changed
state to down
00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0/0,
changed state to down
00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/0, changed state to up
Router>
00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/1, changed state to up
00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Serial0/0,
changed state to down
00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Serial0/1,
changed state to down
00:00:50: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T,
RELEASE
SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:21 by phanguye
00:00:50: %LINK-5-CHANGED: Interface BRI0/0, changed state
to
administratively down
00:00:52: %LINK-5-CHANGED: Interface Ethernet0/0, changed
state to
administratively down
00:00:52: %LINK-5-CHANGED: Interface Serial0/0, changed
state to
administratively down
00:00:52: %LINK-5-CHANGED: Interface Ethernet0/1, changed
state to
administratively down
00:00:52: %LINK-5-CHANGED: Interface Serial0/1, changed
state to
administratively down
00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/0, changed state to down
00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/1, changed state to down
Router>
Router>en
Router#copy start run
Destination filename [running-config]?
1324 bytes copied in 2.35 secs (662 bytes/sec)
Router#
00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0/0:1,
changed state to down
00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0/0:2,
changed state to down
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#enable secret cisco
Router(config)#^Z
00:01:54: %SYS-5-CONFIG_I: Configured from console by
console
Router#sh ip int brief
Interface IP-Address OK? Method
Status Protocol
Ethernet0/0 10.200.40.37 YES TFTP
administratively
down down
Serial0/0 unassigned YES TFTP
administratively
down down
BRI0/0 193.251.121.157 YES unset
administratively
down down
BRI0/0:1 unassigned YES unset
administratively
down down
BRI0/0:2 unassigned YES unset
administratively
down down
Ethernet0/1 unassigned YES TFTP
administratively
down down
Serial0/1 unassigned YES TFTP
administratively
down down
Loopback0 193.251.121.157 YES TFTP
up up
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int Ethernet0/0
Router(config-if)#no shut
Router(config-if)#
00:02:14: %LINK-3-UPDOWN: Interface Ethernet0/0, changed
state to up
00:02:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Ethernet0/0, changed state to up
Router(config-if)#int BRI0/0
Router(config-if)#no shut
Router(config-if)#
00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state
to down
00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:2, changed state
to down
00:02:26: %LINK-3-UPDOWN: Interface BRI0/0, changed state
to up
00:02:115964116991: %ISDN-6-LAYER2UP: Layer 2 for Interface
BR0/0,
TEI 68 changed to up
Router(config-if)#^Z
Router#
00:02:35: %SYS-5-CONFIG_I: Configured from console by
console
Router#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Router#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T,
RELEASE
SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:21 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE
(fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash:c2600-is-mz.120-7.T"
cisco 2611 (MPC860) processor (revision 0x202) with
26624K/6144K
bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
--More-- 8192K bytes of processor board System flash
partition 1
(Read/Write)
8192K bytes of processor board System flash partition 2
(Read/Write)
Configuration register is 0x2142
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#config-reg 0x2102
Router(config)#^Z
00:03:20: %SYS-5-CONFIG_I: Configured from console by
console
Router#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T,
RELEASE
SOFTWARE (fc2)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 02:21 by phanguye
Image text-base: 0x80008088, data-base: 0x80C524F8
ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE
(fc1)
Router uptime is 3 minutes
System returned to ROM by abort at PC 0x802D0B60
System image file is "flash:c2600-is-mz.120-7.T"
cisco 2611 (MPC860) processor (revision 0x202) with
26624K/6144K
bytes of memory.
Processor board ID JAB031202NK (3878188963)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial(sync/async) network interface(s)
1 ISDN Basic Rate interface(s)
32K bytes of non-volatile configuration memory.
--More-- 8192K bytes of processor board System flash
partition 1
(Read/Write)
8192K bytes of processor board System flash partition 2
(Read/Write)
Configuration register is 0x2142 (will be 0x2102 at next
reload)
Router#
